Method of gelling a gelation shrinkable, polymer casting solutio

Details Method of gelling a gelation shrinkable, polymer casting solutio Method of gelling a gelation shrinkable, polymer casting solutio

1983-02-10

1985-01-29

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2105002, 264269, 26433112, 26433119, 427230, 427246, B29D 2704

Patent

active

044965028

ABSTRACT:
A gelation shrinkable, polymer casting solution, that has been cast on the internal surface of a tubular support is gelled using pressure gelation by supporting the tubular support with one end higher than the other and pumping gelation liquid upwardly along the tube at a velocity in the range of the order of 10 to 100 cm/second and at a pressure of at least 10 kPa gauge at all points of contact between the gelation liquid and polymer casting solution. This achieves asymmetricity of the pore structure and ensures that the cast polymer solution is continuously in contact with the tubular support as a gelled membrane. If the tubular support is a porous, tubular support, then preferably the pressure gelation is continued until gelation liquid has passed through the cast polymer solution and the porous support removing solvent and any additives from the cast polymer solution.

REFERENCES:
patent: 3676193 (1972-07-01), Cooper et al.
patent: 3904788 (1975-09-01), Blaha
patent: 3929945 (1975-12-01), Thayer et al.
patent: 3930105 (1975-12-01), Christen et al.
patent: 3983194 (1976-09-01), Richardson et al.
patent: 4061821 (1977-12-01), Hayano et al.
patent: 4177031 (1979-12-01), Thayer et al.
patent: 4346126 (1982-08-01), Kutowy et al.

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